脱式计算. 8.82×15-100 15.8-7/18+14.2-11/18 21.6-0.8×4÷0.8×4 33/5×3.7+3.6+5.3×33/5 2.5×4.4 (1.5+22/3)÷3.75-2/3.

问题描述:

脱式计算.

8.82×15-100 15.8-
7
18
+14.2-
11
18
21.6-0.8×4÷0.8×4
3
3
5
×3.7+3.6+5.3×3
3
5
2.5×4.4 (1.5+2
2
3
)÷3.75-
2
3

(1)8.82×15-100
=132.3-100
=32.3;
(2)15.8-

7
18
+14.2-
11
18

=(15.8+14.2)-(
7
18
+
11
18

=30-1
=29;
(3)21.6-0.8×4÷0.8×4
=21.6-3.2÷0.8×4
=21.6-4×4
=21.6-16
=5.6;
(4)3
3
5
×3.7+3.6+5.3×3
3
5

=3
3
5
×3.7+3
3
5
×1+5.3×3
3
5

=3
3
5
×(3.7+1+5.3)
=3
3
5
×10
=36;
(5)2.5×4.4
=2.5×(4+0.4)
=2.5×4+2.5×0.4
=10+1
=11;
(6)(1.5+2
2
3
)÷3.75-
2
3

=
25
6
÷3.75-
2
3

=
25
6
×
4
15
-
2
3

=
10
9
-
2
3

=
4
9